The height of liquid column in capillary tube is h the radius of capillary tube is r.`rho` is the density of liquid , g is acceleration due to gravity and `theta ` is angle of contact . The surface tension of the liquid is ,

Options

A. `t = (r h rho g)/(2 cos theta)`
B. `T= (2 cos theta )/(h rho g)r`
C. ` T = (2 cos theta )/(r rho h g)`
D. all of these

Answer

A